Bleaching chemicals are used in the pulp and paper industry to increase the brightness of the paper that is produced. Four chemical agents were studied to determine their effect on the brightness of paper produced from pulp treated with the chemical. The null hypothesis H subscript 0 space colon space mu subscript A space end subscript equals mu subscript B space end subscript equals mu subscript C space end subscript equals mu subscript D space end subscript was established for the ANOVA. What is (are) the appropriate alternative hypothesis